I'm using the USPS plugin. On the shopping cart page, the plugin works fine and shows the correct shipping amount.
Clicking "checkout" takes you to the FEC checkout, were at the top is the shopping cart details followed by the customer checkout form.

The shopping cart detail has a line for shipping but all that is there is:


Sub-Total: $48.95
: $0.00
Sales Tax: $0.00
Total: $48.95


Also, the State and Zip code entered on the USPS form are not brought forward into the checkout form.